On Oct. 31, 2013, the Internal Revenue Service (IRS) says employers can allow participants to carry over up to $500 in unused funds into the next plan year. If your plan has a grace period*, it must be eliminated if the carryover is adopted. The plan may also be amended to specify a lower carryover amount, as well as not permit any carryover at all.
To take advantage of this new modified rule for 2013, employers must amend their section 125 cafeteria plan document in writing before the last day of the plan year. The adopted amendment can be effective retroactively to the first day of that plan year, as long as you inform the participants and follow the rules in the Notice, including the following:
For more detail, see http://www.irs.gov/pub/irs-drop/n-13-71.pdf
*Grace period: The IRS allows employers to offer an extended deadline, or grace period, of two and a half months after the end of a plan year to use remaining health FSA funds. If a plan has provided for a grace period and is being amended to add a carryover provision, the plan must also be amended to eliminate the grace period provision by no later than the end of the plan year from which amounts may be carried over.